Ventilating-support for armature-teeth.



T. HIBBARD. VENTILATING SUPPORT FOR ARMATURE TEETH.

Patente@ Apr. 6, 1909.4

DMW/Wam `tion through the structure ,shown in Fig. a.

TRUHAN HIBBARD, OF MINNAPOLI S,lVllNNESOTA.

VENTILATNG-SUPEORT FR ARMATURE-TEETH.

Specification of Letters. Fatent.

Patented April 6, 1909.

Application led November 17, 1905. Serial No. 287,861.

To all whom it may concern:

Be it known that l, TnUMAN -lmnann, of Minneapolis, Hennepin county,niinnetota, have invented certain improvements in Ventilating Supportsfor Armature Teetl'x, of which the following is a specilifgsation.

This invention relates to improvementei in Ventilating supports for thearmature teeth of dynamo-electric machines and the objects l have inView are to provide a simple and inexpensive Ventilating tooth support,that may be readily applied between the laininze composing the armatureand the end plates or rings b y which the laminas are clamped andsecured together, whereby the armature teeth are supported and a freecirculation oi the air between said lamin and the end plates or rings issecured. This Ventilating support is applicable either to a rotating orto a stationary armature.

The invention consists generally in the constructions and combinationshereinafter described and particularly pointed-out in the claims.

In the accompanying drawings forming a part of this speciiication,Figure l is a partial end elevation and section of a rotatable armaturehaving my improved ventilator applied thereto. Fig. 2 is a longitudinalsection of the same, showing the means for holding the ventilator inposition. Fig. 3 is a plan View showing the ventilator as it is stampedout of a piece of sheet metal and before it is bent into staple orU-shape. Fig. 4 is a partial elevation and section of a ring armaturesuch as is used with a rotating field magnet. Fig. 5 is a longitudinalsecln all the drawings 2 represents a series of laminas of which thebody ofthe armature is composed. These laminae are provided with theteeth or projections 3, between which are the spaces for receiving thelongitudinal windings of the electrical conductors. In the structureshown in Figs. l and 2 these teeth project outwardly. In all of thedrawings 5 represents the end rings or plates by means of which thelamin are clamped and held together. l have illustrated but one of theseend arms or plates, but it will be understood that another is providedwhich maybe identical with the one shown between which the laminae 3 arearranged. ln the structure shown in Figs. l and 2 the support G, whiei'n th structure shown in fl 'e they ae arranged within a cf,lindricalfran'ie or support 7. in either instance the laminas will preferably beseparated intervals by suitable ventilators such, for example, as shownand described in an application for patent executed of even dateherewith by James T. Boustead, Charles El. Chalmers and myself filedNovember 17, 1905, Serial No. 287,862.

The end plates 5 of the structure shown in Figs. l and 2 are providedwith suitable Ventilating openings 8, "vhich are connected by radialgrooves with a Ventilating space of annular form, extending around theend plate 5 and between said plate and the 'wall of the nearest lamina.For the purpose of supporting the teeth of the laminee and providingVentilating spaces extending outward beyond the circumference of theplate 5, l provide the staple or U-shaped Ventilating tooth supports 9,one of said supports being arranged between each tooth of the outsidelamina and the inner wall of the plate 5.

`These Ventilating supports are preferably provided with the projectionsl0 which are engaged in an annular groove in the inner surface of theplate 5, (see Figs. l and 2). lt 1vill be seen that these Ventilatingsupports do not in any way interfere with the winding of the armature asthe spacing between the teeth of the laminae are left entirely freewhile at the same time each tooth is supported and there is a freecirculation of air from the openings 8 into the Ventilating spacebetween the inner surface of the plate 5 and the outside lamina andoutward through the spaces between the legs of the staple or U-shapedVentilator. These Ventilating supports engage each tooth of the outsidelamina, which, owing to the fact that the laminte are formed of verythin material would not, unless so supported, retain its position, butwould become bent over the outer edge of the plate 5 and arl/'ay fromthe body of the armature.

ln Figs. e and 5 the Ventilating supports are arranged between the ring5 and the annular outside lamina. Said supports extend inward bearingagainst each tooth of the outside lamina and they are held in positionby the projections l() thereon engaging the annular groove ll in thering 5. In this instance Ventilating openings 13 are formed in laminaeare arranged upon a central shaft or i the frame or support 7, and saidopenings communicate 'with the space between the clamping ring 5 and theoutside lamina. The air passage is formed the same as before between thelegs of the staple shaped support, and the location ot said supportagainst the teeth of the outside lamina prevents interterence With thespaces in which the electrical conductors are Wound.

'Ihe great saving -shich this invention el"- tects, is in providing aninexpensive ventilating tooth support Which When made of only one size,is universally applicable to any size of armature7 in a given type, andarmatures having any number of teeth, thus avoiding a multiplicity ofstyles and sizes, which `would be necessary, were the supports for tvroor more teeth made in one piece.

The saving of pattern expense, and the expense of keeping variousstyles, with diiierent numbers of teeth, on hand to meet uifIerentrequirements, constitute the great utility of this invention, aside fromits Ventilating function. That is to say: this Ventilating toothsupport, made in a given size is univers-ally applicable to armatureswhose spaces for the longitudinal windings betv., een the teeth orprojections, dilier "widely, both as to number and as to dimensions.These supports also prevent vibration of the armature teeth, due tovariation of magnetic density, or other causes7 which vibratioii Wouldtend to injure the insulation oi electrical conductors adjacent thereto,

I claim as my invention:

l. The herein described Ventilating tooth support for armaturesconsisting of a staple or U-shaped piece of metal having projectionsupon one edge thereof.

2. In an armature, having a series of laminas provided with peripheralteeth or projections spaced from one another, an end plate having anannular groove in its inner surface, U-shaped supports interposedbetv/'een saidend plate and the teeth of said laminae, said supportshaving projections thereon adapted to enter said annular groove.

3. In an armature having a series of laninze provided with peripheralteeth or pron jections, spaced from one another, an end plate,L15-shaped supports interposed between said end plate and the teeth ofthe laminee, said supports and said plate having cooperating means forholding said supports in place between said plate and teeth,substantially as described.

In Witness whereof, I have hereunto set my hand this .14th day ofNovember 1905.

TRUMAN I-IIBBARD.

Witnesses:

A. C. PAUL, Ricminp PAUL.

